Energetics of charge order transition in Bi{sub 1-x}Sr{sub x}MnO{sub 3}
- Institute of Chemical Technology, Technicka 5, 166 28 Prague 6 (Czech Republic)
- Institute of Physics of ASCR, Cukrovarnicka 10, 162 53 Prague 6 (Czech Republic)
- Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 6 (Czech Republic)
- Laboratoire CRISMAT, 6 Boulevard Marechal Juin, 14050 Caen Cedex (France)
The transition from the high-temperature pseudocubic form of the perovskite manganites Bi{sub 1-x}Sr{sub x}MnO{sub 3}, x=0.3,0.5,0.8, to their orthorhombically distorted charge-ordered state is examined. As the experimental probe the measuring of the heat capacity by heat flux DSC incremental method above 300K and by relaxation method below 300K is used. While a broad symmetrical transition spanning the temperature interval {delta}T{approx}500K with a maximum at the apparent T{sub CO}{approx}500K is observed for x=0.5, the other two compositions reveal typical {lambda}-shaped peaks often considered as typical for the second order transitions. The total entropy release on heating is interpreted in terms of a simultaneous change of charge, orbital and spin degree of freedom.
- OSTI ID:
- 20900921
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 12; Other Information: DOI: 10.1016/j.jssc.2006.08.021; PII: S0022-4596(06)00473-7; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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